o Implement the stop_boot subroutine [1]. This subroutine can be used by

  scripts in rc.d to stop rc(8) from booting into multi-user mode when
  a critical or severe error condition is encountered.

o Modify scripts in etc/rc.d that already implemented this functionality
  independently.

o Document it.

[1] - This subroutine was implemented in FreeBSD in rc.d/fsck. I moved it
      to rc.subr(8). Our version differs slightly in that it takes an
      optional argument to stop the boot even if "autoboot" is not set.

Obtained from: NetBSD
MFC after: 2 weeks

6 files changed, 26 insertions, 23 deletions

diff --git a/etc/rc.d/fsck b/etc/rc.d/fsck
index 7d329d2..0bc7b08 100755
--- a/etc/rc.d/fsck
+++ b/etc/rc.d/fsck
@@ -14,17 +14,6 @@ name="fsck"
 start_cmd="fsck_start"
 stop_cmd=":"
 
-stop_boot()
-{
-	#	Terminate the process (which may include the parent /etc/rc)
-	#	if booting directly to multiuser mode.
-	#
-	if [ "$autoboot" = yes ]; then
-		kill -TERM $$
-	fi
-	exit 1
-}
-
 fsck_start()
 {
 	if [ "$autoboot" = no ]; then
diff --git a/etc/rc.d/ipsec b/etc/rc.d/ipsec
index 67b7e28..223c204 100755
--- a/etc/rc.d/ipsec
+++ b/etc/rc.d/ipsec
@@ -26,15 +26,7 @@ ipsec_prestart()
 {
 	if [ ! -f "$ipsec_file" ]; then
 		warn "$ipsec_file not readable; ipsec start aborted."
-			#
-			# If booting directly to multiuser, send SIGTERM to
-			# the parent (/etc/rc) to abort the boot
-			#
-		if [ "$autoboot" = yes ]; then
-			echo "ERROR: ABORTING BOOT (sending SIGTERM to parent)!"
-			kill -TERM $$
-			exit 1
-		fi
+		stop_boot
 		return 1
 	fi
 	return 0
diff --git a/etc/rc.d/mountcritlocal b/etc/rc.d/mountcritlocal
index 20d2473..7bec007 100755
--- a/etc/rc.d/mountcritlocal
+++ b/etc/rc.d/mountcritlocal
@@ -43,7 +43,7 @@ mountcritlocal_start()
 	*)
 		echo 'Mounting /etc/fstab filesystems failed,' \
 		    ' startup aborted'
-		kill -QUIT $$
+		stop_boot true
 		;;
 	esac
 }
diff --git a/etc/rc.d/mountlate b/etc/rc.d/mountlate
index 1d4e33f..6da5e79 100644
--- a/etc/rc.d/mountlate
+++ b/etc/rc.d/mountlate
@@ -27,7 +27,7 @@ mountlate_start()
 	*)
 		echo 'Mounting /etc/fstab filesystems failed,' \
 		    ' startup aborted'
-		kill -QUIT $$
+		stop_boot true
 		;;
 	esac
 }
diff --git a/etc/rc.d/root b/etc/rc.d/root
index 35fd9bb..9c20b7b 100755
--- a/etc/rc.d/root
+++ b/etc/rc.d/root
@@ -25,7 +25,7 @@ root_start()
 	*)
 		if ! mount -uw /; then
 			echo 'Mounting root filesystem rw failed, startup aborted'
-			/bin/kill -QUIT $$
+			stop_boot true
 		fi
 		;;
 	esac
diff --git a/etc/rc.subr b/etc/rc.subr
index 8cdb6e7..061f0b9 100644
--- a/etc/rc.subr
+++ b/etc/rc.subr
@@ -40,6 +40,7 @@
 #
 
 : ${rcvar_manpage:='rc.conf(5)'}
+: ${RC_PID:=$$}; export RC_PID
 
 #
 #	Operating System dependent/independent variables
@@ -161,6 +162,27 @@ reverse_list()
 	echo $_revlist
 }
 
+# stop_boot always
+#	If booting directly to multiuser or $always is enabled,
+#	send SIGTERM to the parent (/etc/rc) to abort the boot.
+#	Otherwise just exit.
+#
+stop_boot()
+{
+	local always
+
+	if [ -n "$1" ] && checkyesno $1; then
+		always=true
+	else
+		always=false
+	fi
+	if [ "$autoboot" = yes -o "$always" = true ]; then
+		echo "ERROR: ABORTING BOOT (sending SIGTERM to parent)!"
+		kill -TERM ${RC_PID}
+	fi
+	exit 1
+}
+
 #
 # mount_critical_filesystems type
 #	Go through the list of critical filesystems as provided in